Sideboard



FIG. 1 is a left front perspective view of a sideboard showing my new design;

FIG. 2 is a side view, the opposite side being a mirror image of the side shown;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a partial sectional view taken along line 5--5 in FIG. 3.

The bottom and rear views are not shown and form no part of the claimed design. The dashed lines represent environmental elements only and form no part of the claimed design. 

The ornamental design for a sideboard, as shown and described. 